<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
      </el-alert>
    </el-card>
    <!-- 选择商品分类区域-->
    <el-row class="cat_opt">
      <el-col>
        <span>选择商品分类：</span>
        <!-- 选择商品分类的级联选择框-->

        <el-cascader v-model="selectedCatekeys" :options="catelist" :props="cateProps" expandTrigger='hover'
          @change="handleChange">
        </el-cascader>

      </el-col>
    </el-row>

    <!-- tabs页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <el-tab-pane label="动态参数" name="many">
        <el-button type="primary" size="mini" :disabled='isBtnDisabled' @click="addDialogVisible=true">添加参数</el-button>
        <!-- 动态参数的表格-->
        <el-table :data="manyTableData" border stripe>
          <!-- 展开列-->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable
                @close="handleClose(index,scope.row)">
                {{item}}</el-tag>
              <!--输入的文本框 -->
              <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
              </el-input>
              <!-- 添加按钮-->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <!-- 索引列-->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑
              </el-button>
              <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
              </el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
      <el-tab-pane label="静态属性" name="only">
        <el-button type="primary" size="mini" :disabled='isBtnDisabled' @click="addDialogVisible=true">添加属性</el-button>
        <!-- 静态属性数据-->
        <el-table :data="onlyTableData" border stripe>
          <el-table-column type="expand">
            <template slot-scope="scope">
              <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable
                @close="handleClose(index,scope.row)">
                {{item}}</el-tag>
              <!--输入的文本框 -->
              <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
              </el-input>
              <!-- 添加按钮-->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <el-table-column type="index"></el-table-column>
          <el-table-column prop="attr_name" label="属性名称"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑
              </el-button>
              <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除
              </el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
    </el-tabs>

    <!--添加参数的对话框-->
    <el-dialog :title="'添加' + titleText" :visible.sync='addDialogVisible' width="50%" @close='addDialogClosed'>
      <el-form :model="addForm" ref="addFormRef" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!--修改参数的对话框-->
    <el-dialog :title="'修改' + titleText" :visible.sync='editDialogVisible' width="50%" @close='editDialogClosed'>
      <el-form :model="editForm" ref="editFormRef" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        // 商品分类列表
        catelist: [],
        // 级联选择框的配置
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        // 级联选择框被选中的value
        selectedCatekeys: [],
        // 被激活的页签的名称
        activeName: 'many',
        // 动态和静态属性的数据
        manyTableData: [],
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加表单参数数据
        addForm: {
          attr_name: ''
        },
        addFormRules: {
          attr_name: [{
            required: true,
            message: '请输入参数名称!',
            trigger: 'blur'
          }]
        },
        // 修改对话框的显示与隐藏
        editDialogVisible: false,
        // 点击按钮 修改表单的参数
        editForm: {
          attr_name: '',
          attr_id: 0
        }
      }
    },
    methods: {
      //  获取所有的商品分类列表
      async getCateList() {
        const {
          data: res
        } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败')
        }
        this.catelist = res.data
        console.log(this.catelist)
      },
      // 监听级联选择框选中的事件
      async handleChange() {
        this.getParamsData()
      },
      // 获取动态和静态参数 因为一旦选择也会变化 点击tabs也会变化所以封装成一个方法比较好
      async getParamsData() {
        console.log(this.selectedCatekeys)
        if (this.selectedCatekeys.length !== 3) {
          this.selectedCatekeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return this.$message({
            type: 'info',
            message: '请选择第三级分类',
            duration: 1500
          })
        }

        // 根据所选的分类的id 获取对应的参数
        const {
          data: res
        } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: this.activeName
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败!')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框中的输入的值
          item.inputValue = ''
        })
        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      // tab页签点击事件的处理函数
      handleTabClick() {
        this.getParamsData()
        console.log(this.activeName)
      },
      // 监听对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 点击按钮添加参数
      async addParams() {
        this.$refs.addFormRef.validate(isRight => {
          if (!isRight) {
            return this.$message.warning('信息不规则')
          }
        })
        const {
          data: res
        } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.getParamsData()
        this.addDialogVisible = false
        this.$message.success('添加参数成功')
      },
      // 点击编辑 动态的和静态的
      async showEditDialog(attrId) {
        const {
          data: res
        } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
          params: {
            attr_sel: this.activeName
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败')
        }
        this.editForm.attr_id = attrId
        this.editForm.attr_name = res.data.attr_name
        this.editDialogVisible = true
      },
      // 关闭修改对话框
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      // 提交表单参数的操作
      async editParams() {
        this.$refs.editFormRef.validate(isRight => {
          if (!isRight) {
            return this.$message.info('表单验证不通过，请重新填写！')
          }
        })
        const {
          data: res
        } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 200) {
          return this.$message.error('更新参数失败')
        }
        this.getParamsData()
        this.editDialogVisible = false
        this.$message.success(res.meta.msg)
      },
      // 静态参数和动态参数删除监听
      async removeParams(attrId) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => {
          console.log(err)
        })

        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除')
        }

        const {
          data: res
        } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }
        this.$message.success(res.meta.msg)
        this.getParamsData()
      },
      // 文本框失去焦点，或者按下了回车键
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return false
        }
        // 输入了内容
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
      },
      // 点击按钮显示文本输入框
      showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        this.$nextTick(_ => {
          // 这里只是获取了input Dom对象调用focus()方法  那必须要在元素渲染完后再执行这个自动获取焦点的方法
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 删除对应的参数可选项
      async handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        await this.$http.delete()
        this.saveAttrVals(row)
      },
      // 将对 attr_values的操作 保存到数据库
      async saveAttrVals(row) {
        // 发送请求保存到数据库
        const {
          data: res
        } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
      }

    },
    computed: {
      // 如果按钮需要被禁用 则返回true 否则为false
      isBtnDisabled() {
        if (this.selectedCatekeys.length !== 3) {
          return true
        }
        return false
      },
      // 当前选中的三级分类的id
      cateId() {
        if (this.selectedCatekeys.length === 3) {
          return this.selectedCatekeys[2]
        }
        return null
      },
      // 动态计算标题的文本
      titleText() {
        return this.activeName === 'many' ? '动态参数' : '静态属性'
      }
    },
    created() {
      this.getCateList()
    }
  }

</script>
<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }

</style>
